Folding support or trestle.



No. 718,600. PATENTED JAN. 20, 1903.

A. BURRI & L. HELFERIGH. FOLDING SUPPORT 0R TRESTLE.

APPLIOATION FILED MAR. 15, 1902.

N0 MODEL.

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UNITED STATES PATENT OFFICE;

ALOIS BURRI AND LOUIS HELFERICH, OF LAUSANNE, SWITZERLAND.

FOLDING SUPPORT OR TRESTLE.

SPECIFICATION formingpart of Letters Patent N 0. 718,600, dated January 20, 1903. Application filed March 15, 1902. Serial No. 98,432. (No model.)

To all whom it may concern.-

Be it known that we, ALOIS BURRI and LOUIS HELFERICH, manufacturers, citizens of Switzerland, residing at 27 La Borde, in the city of Lausanne, Switzerland, have invented a certain new and useful Folding Support or Trestle, of which the following is a specification.

This invention has reference to a folding support, scaffold, or trestle for use in bricklaying, whitewashing, and similar kind of work, for wall and ornamental painting, for gas-fitters, well-sinkers, for electricians, in short, for all kinds of work which have to be carried on at different heights. It is evident that displaceable supports or trestles may ontirely replace a scaffold for various kinds of work.

Our improved support is shown on the accompanying drawings, in Figure 1, in front view, and in Fig. 2 in side View.

The support, which is made in two identical sections connected by suitable braces, is made up of two pipes 61., to the upper end of which lateral standards (1 are pivotally attached at c by means of a ring 7), these standards being also connected by links with the lower part of the said tubes. The tubes are each provided with an extension e, to which is attached a lateral projection f, Which, while constituting a journal g for the shaft h, which connects both tubes with each other, is also provided with a movable staple 2', provided with a ratchet-tooth k. This tooth can en-' gage with the teeth of a wheel Z, journaled upon the shaft h and rotatable in the extension 6.

Within the tubes at are telescoping in a vertical direction the tubes m, the upper ends of which are connected with each other by braces n. These inner tubes m are provided at the side facing the proj ection f with means, such as holes 0, for enabling these tubes to be vertically displaced and corresponding to the teeth of the wheel Z. The tubes are con-- nected with each other by suitable braces. In the normal position the standards dare resting closely against the tubes a, and the tubes m are pushed back into the tubes a sufficiently to leave only the braces a projecting. If two supports or trestles of this kind with their braces unfolded or spread out are used, supporting-boards may be placed on top of the braces or supports n, on which the workmen may stand. If it is desired to raise the support, the staple or ratchet-pawl 41 is raised, and it is then only necessary to turn the shaft 71. in a certain direction and preferably by means of a crank. The teeth of the wheel Z engaging with the holes of the tubes m, the latter are raised and the supports n also.

If the support or trestle is to be folded up, the wheels Z and the shaft h are turned in opposite direction.

We are aware that foldable supports with pivoted legs and vertically displaceable shanks are old, and we do not claim such a combination broadly; but

What we claim, and desire to secure by Letters Patent of the United States, is

In a two-sectioned folding support, the combination with two pairs of legs at a dis tance from each other and suitable braces between such pairs, of a tube stationary between each pair and to which the said legs are pivoted, a telescoping rack-bar within each of the said tubes and a pinion or toothed wheel for each of the tubes on a common shaft for raising and lowering the said rack-bar and means to retain the pinion and the rack-bar in position, substantially as described.

In witness whereof we have hereunto set our hands in presence of two'witnesses.

ALOIS BURRI. Louis HELFERIOH.

Witnesses FRANgoIs MARQUIS, FRANgoIs BELTRAMI. 

